Fan.



No. 873,257.- 4 PATENTED DEG. 10, 1907. T. M. MULKBRINS.

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APPLIoATIoN FILED JUNI: 25.1906. 4

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[NVE/WOR PATBNTED 1350.10. 1907. T. M. MULKBRINS.

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APPLmATIoN FILED m1111126. 1906.

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THOMAS M. MULKERINS, OF CHICAGO, ILLINOIS.

FAN.

y Specification of Letters Patent.

Application led June 25. 1906. Serial No. 323257.

To all whom 'it may concern.'

` Be it known that I, THOMAS M.MULKER INS, citizen of the United States, residing at Chicago, in the county of Cook and State of Illinois, have invented newand useful I mprovements in Fans, of which the following is a specification.

This device relatesv to a fan driven by a spring motor, and among the principal features areymeans for operating the fan so as to be noiseless, whereby it may be usedV in places where silence is desirable, such as hospitals, bedrooms, confessionale, and the like. y The fan is reversible so that it can be attached to the bottom or top of the driving shaft and is also provided with improved governing means which prevent the fanfrorn running at too high a speed and at the same time avoids the vibrations and noise which usually accompany the running of an electric fan.

In the accompanying drawings, Figure 1 is a perspective view of the device, the casing bracket.

being removed from same. Fig. 2 is aside view of the same showing it mounted on a Fig. 3 is a sectional elevation of the same. Fig. 4isa plan of the ball bearing which supports the shaft of the governor. Fig. 5 is a` section of a modified form of governor and Fig 6 is an enlarged detail of the sFame. Fig. 7 is a section on the line 7 --7 of ig- 3. l

The device has a frame with two plates l0 and 10a, between which are mounted the gearing for driving the fan. 11 is a casing surrounding the same.

12 is a spring motor of any suitable ordesired construction. By means of intermediate gearing, the motor drives a gear 7 which drives a pinion 8 on the main shaft 80 of the fan, which revolves the fan A and also the governor B. The shaft 80 is hollow and either end receives the stem or spindle 81 of i the fan, which is fixed by a set screw 84 which engagesthe spindle. The fan is thus reversible with respect to the ends of the shaft-and by reversing the direction of rotation of the'shaft will make air currents in either direction out or in as desired. In using it for a downward current it is mainly lto provide a circulation of the air in hot weather; in the other direction it is intended more for ventilation.

The gdvernor has angular arms 24 pivoted to a sleeve-l0 on the shaft 80, and the lower the button'at adjustment in or out.

ends or branches of the arms are provided with weights 24h and the upper ends of the same have friction sleeves '24. These sleeves may be made of rubber, cork, leather, or the like.

` 25 is a cushioned plate mounted upon legs 25a on the casing in position around the shaft to be engaged by the friction sleeves 24C when thrown against the same by the centrifugal action of the weights. The cushion 25 is provided with a resilient packing, such as wadding, cotton, or the like.

In the modification shown in Figs. 5 and 6, for use when they device is arranged with the fan revolving on a horizontal axis, I employ a governing device consisting of several arms plunger 28 behind which is a' spring 28c and' a rod 28d having a set screw 28f for fixing An annular cushion 29 is mounted upon the casing or frame, and the said buttons engage the inside of the4 same when revolving, creating friction which prevents too high speed.

The spindle 81 is movable or extensible in the hollow shaft 80. Thus the fan may be lowered orA raised so as to bring the cooling breeze from the same nearer or farther away as desired. This is accomplished by adjusting the same by means of the set screws 84..

The weight of the fan and its appurtenances are carried entirely by one bearing, which consists of two concentric rings 90 and 91, extending around the shaft and having raceways 91et and 911D for the balls 92. These balls are spaced apart, and springs 93 are located there between to keep the same in position. The outer ring is supported by a hollow or annular bracket-94 attached to the base plate ofthe casing, the inner ring is fixed to the shaft.

100 is a set screw carried by a lug on the bracket, `and it may be set against the shaft to stop the machine.

The rotation of the shaft 80 causes Vthe weights 24h to ily out according to the speed, and at a certain point this causes the arms to 4lift the sleeves against the under surface of the cushion 25, which produces friction and a noiseless braking action in consequence of the soft quality of the cushion. The reversal of the fan from one end of the shaft to the other allows it to be used in many placeswhere it could not be `other- Patentea Dee. 1o, 1907.

wise used, and a cheap and ellicient fan is provided particularly suitable for use where freedom from noise is necessary or desirable. I claim:

5 In a fan, in combination, a casing having upper and lower plates, a motor mounted thereon, a tubular fan shaft extending through the casing and mounted in bearings on said plates, gearing within the casing,

l0 between the shaft and the motor, a spindle adjustable lengthwise within the shaft, a fan, and means to attach the same to either end of the spindle.

In testimony whereof I have signed my name to this specification in the presence ol 15 tWo subscribing witnesses.

THOMAS M. MULIIERINS.

Witnesses:

A. J. BELLE, H. G. BATCHELOR. 

